ASTM D6677-01

Standard Test Method for Evaluating Adhesion by Knife

SCOPE
1.1 This test method covers the procedure for assessing the adhesion of coating films to substrate by using a knife.
1.2 This test method is used to establish whether the adhesion of a coating to a substrate or to another coating (in multi-coat systems) is at a generally adequate level.Note 1
The term "substrate" relates to the basic surface on which a coating adheres (may be steel, concrete, etc. or other coating).
1.3 This method can be used in the laboratory and field.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-May-2001
• ICS: 19.040 - Environmental testing
• ICS: 25.220.01 - Surface treatment and coating in general
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.46 - Industrial Protective Coatings

Relations

• Replaced By: ASTM D6677-07 - Standard Test Method for Evaluating Adhesion by Knife
• Effective Date: 01-Jul-2007
• Referred By: ASTM D7230-06(2021) - Standard Guide for Evaluating Polymeric Lining Systems for Water Immersion in Coating Service Level III Safety-Related Applications on Metal Substrates
• Effective Date: 10-May-2001
• Referred By: ASTM D5163-16(2021) - Standard Guide for Establishing a Program for Condition Assessment of Coating Service Level I Coating Systems in Nuclear Power Plants
• Effective Date: 10-May-2001
• Referred By: ASTM D6943-15(2019) - Standard Practice for Immersion Testing of Industrial Protective Coatings and Linings
• Effective Date: 10-May-2001
• Referred By: ASTM G210-13(2023) - Standard Practice for Operating the Severe Wastewater Analysis Testing Apparatus
• Effective Date: 10-May-2001
• Referred By: ASTM D5064-16a(2021) - Standard Practice for Conducting a Patch Test to Assess Coating Compatibility
• Effective Date: 10-May-2001
• Referred By: ASTM D4619-12(2018) - Standard Practice for Inspection of Linings in Operating Flue Gas Desulfurization Systems
• Effective Date: 10-May-2001
• Referred By: ASTM D7167-12(2018) - Standard Guide for Establishing Procedures to Monitor the Performance of Safety-Related Coating Service Level III Lining Systems in an Operating Nuclear Power Plant
• Effective Date: 10-May-2001
• Referred By: ASTM F3182-23 - Standard Practice for the Application of Spray-Applied Polymeric Liners Inside Pipelines for Potable Water
• Effective Date: 10-May-2001
• Referred By: ASTM D5498-12a(2018) - Standard Guide for Developing a Training Program for Personnel Performing Coating and Lining Work Inspection for Nuclear Facilities
• Effective Date: 10-May-2001
• Referred By: ASTM D3276-21 - Standard Guide for Painting Inspectors (Metal Substrates)
• Effective Date: 10-May-2001
• Referred By: ASTM D5065-17(2021) - Standard Guide for Assessing the Condition of Aged Coatings on Steel Surfaces
• Effective Date: 10-May-2001
• Referred By: ASTM D6944-15(2020) - Standard Practice for Determining the Resistance of Cured Coatings to Thermal Cycling
• Effective Date: 10-May-2001
• Referred By: ASTM D6237-19 - Standard Guide for Painting Inspectors (Concrete and Masonry Substrates)
• Effective Date: 10-May-2001
• Referred By: ASTM D6577-15(2019) - Standard Guide for Testing Industrial Protective Coatings
• Effective Date: 10-May-2001

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D6677–01
Standard Test Method for
Evaluating Adhesion by Knife
This standard is issued under the fixed designation D 6677; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope found useful as a simple means of assessing the adhesion of
coatings.Although this method is a qualitative and a subjective
1.1 This test method covers the procedure for assessing the
test it has been used in industry for many years and can provide
adhesion of coating films to substrate by using a knife.
valuable information.
1.2 This test method is used to establish whether the
4.2 Other adhesion test methods may be useful in obtaining
adhesion of a coating to a substrate or to another coating (in
quantitative results. See D 2197, D 3359 and D 4541.
multi-coat systems) is at a generally adequate level.
4.3 The Performance Evaluation Scale (see 7.4, Table 1) is
NOTE 1—The term “substrate” relates to the basic surface on which a
based on both the degree of difficulty to remove the coating
coating adheres (may be steel, concrete, etc. or other coating).
from the substrate and the size of removed coating.
1.3 This method can be used in the laboratory and field.
4.4 This test method does not have a known correlation to
1.4 The values stated in SI units are to be regarded as the
other adhesion test methods (pull-off, tape, etc.).
standard. The values given in parentheses are for information
4.5 A coating that has a high degree of cohesive strength
only.
may appear to have worse adhesion than one that is brittle and
1.5 This standard does not purport to address all of the
hence fractures easily when probed.
safety concerns, if any, associated with its use. It is the
5. Apparatus and Materials
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5.1 Cutting Tool—Sharp utility knife.
bility of regulatory limitations prior to use.
5.2 Cutting Guide—Steel or other hard metal straight edge
to ensure straight cuts.
2. Referenced Documents
6. Test Specimen
2.1 ASTM Standards:
D 2197 Test Methods for Adhesion of Organic Coatings by
6.1 When this test method is used in the field, the specimen
Scrape Adhesion.
isthecoatedsubstrateonwhichtheadhesionistobeevaluated.
D 3359 Test Methods for Measuring Adhesion by Tape
6.2 For laboratory use, apply the materials to be tested to
Test.
panels of the composition and surface conditions on which it is
D 4541 Test Method for Pull-Off Strength of Coatings
desired to determine adhesion.
Using Portable Adhesion Testers.
NOTE 2—If desired or specified, the coated test panels may be subjected
to a preliminary exposure such as water immersion, salt spray, or high
3. Summary of Test Method
humidity before conducting the knife adhesion test.
3.1 Adhesion is determined by making an “X” cut into the
7. Procedure
coating film to the substrate and by lifting the coating with a
knife. Adhesion is evaluated qualitatively ona0to10 scale.
7.1 Select an area free of blemishes and surface imperfec-
tions.
4. Significance and Use
7.2 Using a sharp knife and cutting guide, make two cuts
4.1 Coatings, to perform satisfactorily, must adhere to the
into the coating with a 30 to 45 ° angle between legs and down
substrates on which they are applied.This test method has been
tothesubstratewhichintersectstoforman“X”.Makeeachleg
of the angle a minimum of 38.1 mm (1 ⁄2 in.) in length.
Disregard coating removed during cutting process.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
7.3 Employing the point of the kn
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